Barack Obama heckled by Manning supporter

President Barack Obama was heckled on Friday by a supporter of Bradley Manning, the American solider who has been sentenced to 35 years for leaking secret US documents to whistleblower website WikiLeaks, with the protester demanding his release.

Obama was speaking at a high school in Syracuse, New York and briefly paused in his remarks to acknowledge the woman, who was then escorted from the auditorium.

"I hear you, I hear you," Obama responded to the heckler.

The heckler continued, and much of the rest of the audience shouted her down.

Obama's speech was interrupted for about a minute as he tried to control the crowd.